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The Underground City (Chinese: 地下城; pinyin: Dìxià Chéng; Wade–Giles: Ti4-hsia4 Chʻêng2) is a Cold War era bomb shelter consisting of a network of tunnels located beneath Beijing, China. It has also been referred to as the Underground Great Wall since it was built for the purpose of military defense. The complex was constructed from 1969 to 1979 in anticipation of a nuclear war with the Soviet Union, as Sino-Soviet relations worsened[1][2] and was officially reopened in 2000.[3] Visitors were allowed to tour portions of the complex,[3] which has been described as "dark, damp, and genuinely eerie".[4] Underground City has been closed for renovation since at least February 2008.[1]